XML Parsing With DOM

1) Create XML Builder

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();

2) Create XML Document

File f = ...;
Document doc = builder.parse(f);

URL u = ...;
Document doc2 = builder.parse(u);

InputStream in = ...;
Document doc3 = builder.parse(in);

3) Get Root Element

Document doc = ...;
Element root = doc.getDocumentElement();
String name = root.getTagName();

4) Iterate Children of Element

Element element = ...;
NodeList children = element.getChildNodes();
for (int i = 0; i < children.getLength(); i++) {
    Node child = children.item(i);
    if (child instance of Element) {
        Element childElement = (Element) child;
        ...
    }
}

5) Iterate (Alternative) Children of Element

Element element = ...;
for (
    Node childNode = element.getFirstChild();
    childNode != null;
    childNode = childNode.getNextSibling()
) {
    if (childNode instance of Element) {
        Element childElement = (Element) childNode;
        ...
    }
}

6) Get Data from Text Node

Node child = ...;
if (child instanceof Text) {
    Text textNode = (Text) child;
    String text = textNode.getData().trim();
    if (childElement.getTagName().equals("name")) {
        name = text;
    }
    else if (childElement.getTagName().equals("size")) {
        size = Integer.parseInt(text);
    }
}

7) Iterate Atributes of Node

Element element = ...;
NamedNodeMap attributes = element.getAttributes();
for (int i = 0; i < attributes.getLength(); i++) {
    Node attributeNode = attributes.item(i);
    String name = attribute.getNodeName();
    String value = attribute.getNodeValue();
}

8) Get Attribute by Name

Element element = ...;
String unit = element.getAttribute("unit");

PS: See Also: (XmlDomViewer Sample Source)
DomTreeCellRenderer.java
DomTreeFrame.java
DomTreeModel.java
XmlDomViewer.java

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